Cabinet-maker s clamp



UNITED STATES ATENT EEIcE.

WILLIAM E. SHELDON, OF MEDFORD, MASSACHUSETTS.

CABINET-MAKERS CLAMP.

SPECIFICATION forming part of Letters Patent No. 319,517, dated June 9,1885.

Applicai ion filed October 27,1884. (No model.) I

.To ctZZ whom it may concern:

Be it known that I, WILLIAM E. SHELDON, of Medford, in the county ofMiddlesex and State of Massachusetts, have invented a new and usefulImprovement in Cabinet-Makers Glampswof which the following is aspecification.

This clamp is intended as an improvement over those now generally in usein cabinetmakers shops for holding tightly together glued pieces, &c.;and the invention relates to the tailbloek and the means whereby thesame is held in any desired position.

In the accompanying drawings, in which similar letters ofreferenceindicate like parts, Figure 1 is a view in perspective of myirnproved clamp. Fig. 2 is an enlarged plan view of the tail-block inposition, a portion of the plate II being represented as broken out.Fig. 3 is a longitudinal vertical section of the same.

A represents the bar, provided, as usual, with the transverse grooves con its under side. B is the head-block, provided with the screw C, andplaced in the frame D so as to be adjustable vertically therein, allsubstantially as described and shown in Letters Patent No. 295,589,granted to Ine March 25, 1884. E is the tail-block, ehambered at c, suchchamber being covered by the plate I-I, 'which is secured to the beveledportion, as shown. I is 4the usual swingingbar or catch, adapted to holdthe tail-block in any desired position against the pressure of the screwC by catching in one of the grooves a. This swinging bar lies in thechambere and extends downward around the bar A, as shown. It is ofcourse necessary that the swinging bar l should be held up against theunder side ofthe bar A, and should extend toward the head-block in sucha manner that it will be sure to catch in a groove a when the tail-blockis moved, and hold the latter iirmly in position. I accomplish this in avery simple manner by attaching one end of a coiled spring,fl, at L, to

the swinging bar I, and allowing the other end, K', to extend downwardand press upward against the under side of the plate H. Thus the actionof the swinging bar is made automatic and positive in a simple and eftiycient manner.

It will be observed that the upper end of the link I is placedsufficiently to the rear of the centre of the block E to prevent saidblock from kicking up behind. The coiled spring K, being secured withinthe chamber e and concealed by the face-plate H, prevents the lodgmentof glue or other foreign matterbeneath the spring.

I am aware that tail-blocks have heretofore been provided with a linkoperated by a tlat exposed spring, and with a guide-plate working ingrooves extending the entire length of the bar A, to prevent the rearend of the tailblock from tilting, such being shown in Patent No.131,195, granted to J. A Traut, under date ofSeptember 10, 1872',butsuch construction is objectionable in that thegrooves and flat spring are liable to become clogged with glue, which is always used incabinet-makers work. By means of my improvement this objection isentirely obviated.

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, isl In a cabinet-makers clamp, thecombination, with the bar A, grooved at c, and pro. vided with the usualhead-block and screw, of the tail-block E, chainbered at e and providedwith the coveringplate H, the swinging bar I, and the spring K, securedat one end to the swinging bar in the chamber e, and with the free endextending downward and bearing against the under side of the plate I-I,vsubstantially as and for the purpose set forth.

YVILLIAM E. SIIELDON.

Witnesses:

HENRY W. WILLIAMs, J. M. HAR'INE'IT.

